Ad flour, sugar, baking powder, cinnamon and salt together in a bowl. Mix well. Add eggs, milk and vanilla. Combine together into a batter. Fold in apples.
Spray heated air fryer basket with non stick spray. Quickly scoop up 1/4 of a cup of batter and pour into lumps inside basket. Leave 2" in between each one. Close and cook for 5 minutes.
Open, flip them over and continue to cook for 2 more minutes. Remove and add more, makes about 10.
To make the glaze melt butter in a pan on the stovetop. Remove and allow to cool a bit, then incorporate the powdered sugar and bit of milk to thin it out. Spoon this over fritters and enjoy.